轻质环氧基复合材料隔热性能的实验与数值研究

通过实验和数值模拟方法研究了空心玻璃微球/环氧树脂复合材料隔热性能。首先使用ANSYS/APDL建立代表性体积单元,探讨了模拟过程中模型尺寸、填料体积分数、填料平均粒径及基体与填料导热系数之比(λ_m/λ_p,λ_m保持不变)对复合材料导热系数的影响。数值研究结果表明:当代表性体积单元尺寸大于500μm时,模型尺寸对复合材料导热系数的计算结果影响较小;复合材料导热系数随填料体积分数和λ_m/λ_p的增大而减小,且基本不受填料粒径影响。其次,将复合材料导热系数实验值和计算结果进行对比,比较发现导热系数计算结果和实验值及Agari模型理论值吻合较好,证明了计算方法的可靠性。同时,空心玻璃微球的掺入有效地降低了树脂的密度。轻质隔热的空心玻璃微球/环氧树脂复合材料有潜力成为一种具有广泛应用前景的节能环保材料。

EXPERIMENTAL AND NUMERICAL STUDY ON THERMAL INSULATION PERFORMANCE OF LIGHT EPOXY COMPOSITES

The thermal insulation performance of hollow glass bead/epoxy composites were studied by experiment and numerical simulation method.The representative volume element was established by ANSYS/APDL parametric finite elements analysis technology,and then the effects of model size,volume fraction,particle size and ratio of thermal conductivity of matrix and particle (λm/λp,λm remain a constant) on the thermal conductivity of composites were investigated.The numerical results show that model size has little influence on the thermal conductivity of composites when it is larger than 500 μm.The thermal conductivity of composites decreases with the increase of volume fraction of particle and λm/λp.What is more,the thermal conductivity of composites is barely affected by the particle average size.By comparison,the calculated values are in good agreement with theoretical and measured values,which proves the reliability of the calculation method.In addition,the incorporation of hollow glass bead effectively reduces the density of the resin.Lightweight insulated hollow glass bead/epoxy composites have the potential to become an energy-saving and environmentally friendly material with a wide range of applications.